Finding the Fourth Proportional to 139,364.79, 209,046.78 and 50,617.95

Step by Step Solution

1. Step 1: Write the proportion equation
   139,364.79 : 209,046.78 = 50,617.95 : x
2. Step 2: Convert to fraction form
   139,364.79/209,046.78 = 50,617.95/x
3. Step 3: Cross multiply
   139,364.79x = 209,046.78 × 50,617.95
4. Step 4: Simplify right side
   139,364.79x = 10,581,519,457.70
5. Step 5: Solve for x
   x = 10,581,519,457.70/139,364.79
6. Step 6: Final answer
   x = 75,926.78